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@(#)umask.2 4.1 (Berkeley) 05/09/85

C 4 umask - set file creation mode mask umask(complmode) Umask sets a mask used whenever a file is created by creat (2) or mknod (2): the actual mode (see chmod (2)) of the newly-created file is the logical and of the given mode and the complement of the argument. Only the low-order 9 bits of the mask (the protection bits) participate. In other words, the mask shows the bits to be turned off when files are created.

The previous value of the mask is returned by the call. The value is initially 022 (write access for owner only). The mask is inherited by child processes.

creat(2), mknod(2), chmod(2) (umask = 60.)

sys umask; complmode